中文摘要：

采用煤油稀释食用菌油,建立电感耦合等离子体质谱法直接进样测定其中多元素的新方法。针对煤油具有较低饱和蒸汽压和较好的热稳定性,使用窄内径进样炬管并选择高温等离子体工作条件确保低电离效率元素获得了较好的分析信号强度,同时维持了等离子体炬焰的稳定;采用碰撞/反应池消除了由有机基质中碳、氢元素形成的多原子离子所造成的高背景信号,选择在载气中通入体积分数20%氧气以防止有机溶剂直接进行分析时形成积碳阻碍质谱分析通道。研究表明,方法的线性关系良好,26个元素的线性相关系数不小于0.999 8;检出限在0.018～92.27 ng/g范围内;精密度高,相对标准偏差（n=11）不大于4.4%;准确性好,各元素的回收率为92.60%～106.16%。该方法简单,适用于不同食用菌油中无机元素的质量控制和安全评估的要求。

英文摘要：

A new method for the determination of multiple elements in edible mushroom oil with direct injection by inductively coupled plasma mass spectrometry（ICP-MS） was established.Samples were diluted using kerosene,as it has some useful characteristics such as lower saturated vapor pressure and better thermal stability,and thus narrow injector torch and high temperature plasma were used to ensure good determination of the elements with low ionization efficiency and maintain the stability of the plasma torch.The collision reaction cell（CRC） method was adopted to eliminate the background signals caused by polyatomic ion interferences from organic matrix.An optional gas flow of 20% O_2 in Ar was added to the carrier gas to prevent carbon build up on the interface cones.The results showed that the limits of detection（LODs） of the method were in the range of 0.018–92.27 ng/g for 26 elements.Its linear correlation was preferable with a correlation coefficient of no less than 0.999 8.The precision expressed as relative standard deviation（RSD,n = 11） was no greater than 4.4%,and the recoveries of the analytes were in the range of 92.60%–106.16%.This method was simple and applicable for the quality control and safety evaluation of inorganic elements in different edible mushroom oils.